Predicting digestibility of ammonia fiber explosion (AFEX)-treated rice straw |
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Authors: | Gollapalli Lisa E Dale Bruce E Rivers Douglas M |
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Institution: | (1) Department of Chemical Engineering, Michigan State University, 48824 East Lansing, MI;(2) MBI, International, 3900 Collins Road, 48910 Lansing, MI |
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Abstract: | The enzymatic digestibility of ammonia fiber explosion (AFEX)-treated rice straw was modeled by statistically correlating
the variability of samples to differences in treatment using several different analytical techniques. Lignin content and crystallinity
index of cellulose affect enzymatic hydrolysis the most. X-ray diffraction was used to measure the crystallinity index (CrI),
while fluorescence and diffuse reflectance infrared (DRIFT) spectroscopy measured the lignin content of the samples. Multivariate
analysis was applied to correlate the enzymatic hydrolysis results of the various samples with X-ray diffraction and spectroscopic
data. Principal component analysis (PCA) and multilinear regression (MLR) techniques did not accurately predict the digestibility
of the rice straw samples. The best correlation (R value of 0.775) was found between the treatment conditions of the AFEX process and the concentration of xylose at 24 h after
enzymatic hydrolysis. |
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Keywords: | Lignocellulose enzymatic digestibility lignin crystallinity AFEX correlation pretreatment X-ray diffraction fluorescence DRIFT |
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